Device for expanding coprocessor command set

One kind of coprocessor instruction set extension device, the set of instructions in the host processor connected to said coprocessor comprises: means for generating the number of immediate coprocessor instruction code generates a command, and for implementing the Association the processor instruction code from the main processor to the coprocessor general register of the instruction register loads the instruction code of coprocessor load instruction; comprise a general purpose processor immediately number generating unit, and a main processor for general purpose registers stored in the main processor coprocessor instruction register code is loaded into the coprocessor instruction register of coprocessor instruction execution unit loading; coprocessor instruction includes a coprocessor registers and the coprocessor instruction executing module. The present invention has good scalability, good flexibility.